ROSEVILLE, October 13, 2023 –  The Placer Mosquito and Vector Control District detected invasive Aedes aegypti mosquitoes in a new area of Roseville this week. Aedes aegypti mosquitoes, commonly known as the yellow fever mosquitoes, were found in the Stanford neighborhood of Roseville.

Aedes aegypti mosquitoes have been spreading throughout California since 2013. This mosquito is small with black and white striped legs and a white violin-shaped marking on its back. Aedes aegypti can transmit several viruses, including Zika, dengue, chikungunya and yellow fever. These viruses, however, have not been found circulating in California.

Placer Mosquito will follow its invasive mosquito response plan to determine the extent of the infestation. The District will need residents to help by allowing our technicians to access and inspect front and back yards of nearby properties to the Stanford neighborhood.

This detection marks the second location where invasive Aedes have been found in Roseville for 2023. Since June, invasive Aedes have been detected in the Cherry Glen, Hillcrest, Cresthaven and Theiles Manor neighborhoods of Roseville.

For the most up to date information about invasive Aedes in Placer County, visit

History of Invasive Aedes Mosquitoes in Placer County

  • August 29, 2019 – First invasive Aedes aegypti mosquito detected in south Placer County
  • Summer 2020 and 2021 – No invasive mosquito detections
  • July 14, 2022 – Aedes aegypti mosquito found in Granite Bay
  • August 3, 2022- More Aedes aegypti mosquitoes and larvae detected in Cresthaven, Theiles Manor, Cherry Glen and Hillcrest neighborhoods of Roseville
  • June 13, 2023 – Aedes aegypti mosquito found in Cherry Glen neighborhood of Roseville
  • Summer 2023 – Aedes aegypti mosquitoes endemic in Cherry Glen, Hillcrest, Cresthaven and Theiles Manor neighborhoods of Roseville
  • October 12, 2023 – Aedes aegypti mosquitoes found in Stanford neighborhood of Roseville

How to Protect Yourself from Invasive Aedes

  • Report unusual, daytime mosquito biting to the District
  • Eliminate standing water, runoff or pooling from irrigation systems
  • Use EPA-registered repellents to prevent mosquito bites

For more information, contact the Placer Mosquito and Vector Control District at (916) 380-5444 or Follow the District on FacebookTwitterInstagram and TikTok: @placermosquito. For a list of EPA-registered repellents, please visit or